routined process eat a lot of cpu

Try opening the Activity Monitor >> View >> View ALL processes. In top Right type in routined and see how many are running of this process. Should be only one.

If you want to see what is Open in this process - Select the process and in Top Left second Icon in from Right is an Icon called Inspect this process then in Tab called Open files and Port. This will indicate all the files aOpened and in se by the process.

While in Activity Monitor as per pervious posting - Select the routined process and in below picture Upper Left and click it. A pop up will appear and click Yes. This should Force Quit the process. Note: Since this is a System Process - it may relaunch automatically - normal.

Should it reappear and present the same issue again - suggest restarting in Safe Mode. To do that on Intel Computer - Immediately at restart hold the SHIFT key until the Apple Logo appears then release. The Safe mode does a Repair Disk, clears cache files and only loads Apple Software, extensions and fonts. It will load slowly - normal. Once logged in - run this way for 5 - 7 minutes and Test if the routined process is acting the same ( excess CPU usage) or as expected.

Before attempting a Re-Installation. Please read below and if any of these apply to this computer, please address.

Should nothing below apply - the Re-Installation will not hurt and may or may not fix the issue.

Are there any AntiVirus, Disk Cleaner, Optimizers, Defrag, VPNs etc installed which should be removed as per Developers Instructions. They are useless, unneeded, cause havoc and interfere with the normal operation of the OS and may even Corrupt the OS requiring a Reinstallation

Any Third Party Applications that will interfere with the normal operation of the OS, alter, modify, remove or delete or attempt to do so is an invitation for disaster.

There are no known Viruses in the wild that self replicate and affect macOS. There are Malware and Adware that does affect macOS and are often times downloaded as part of an Application from Third Party UnTrusted Site and get installed along with the Application.